Automatic Refracto-Keratometer

Abstract

An auto refracto-keratometer not only produces a black-and-white image for observing the alignment of eyes to be examined using an infrared illumination light but also has a color observation optical system for observing a condition of eyes to be examined using color-illumination light. The auto refracto-keratometer comprises an infrared optical system for examining an alignment and corneal curvature of eyes to be examined; a fogging optical system for relaxing accommodation of the eyes; a measuring optical system for measuring refractive power of the eyes; and a color observation optical system having a visible light source for emitting at least one visible light to the eyes and a 2-dimensional imaging device for detecting image of visible light reflected by the eyes.

Description

[0001]This application claims the priority benefits of Korean Patent Application No. 10-2011-0006984 filed on Jan. 24, 2011, and Korean Patent Application No. 10-2011-0010700 filed on Feb. 7, 2011. All disclosures of the Korean Patent applications are incorporated herein by reference.FIELD OF THE INVENTION[0002]This invention relates to an automatic refracto-keratometer, and more particularly, to an automatic refracto-keratometer which not only produces a black-and-white image for observing an alignment of an eye to be examined using an infrared illumination light but also has a color observation optical system for observing the eye using a color illumination light. This invention also relates to a method for evaluating a fitting state of contact lens with an image processing technique for detecting a dye pattern by using the automatic refracto-keratometer.BACKGROUNDS OF THE INVENTION[0003]An automatic refracto-keratometer is a precise measuring-instrument used in the field of ophth...

AI Technical Summary

Benefits of technology

[0012]It is still another object of the present invention to provide a method for evaluating a fitting state of a contact lens which improves efficiency and productivity in prescribing a contact lens.

[0016]An eye and / or a contact lens placed on the eye are observed with the color observation optical system in the refracto-keratometer of the present invention. The prescription of a contact lens can be carried out effectively with the refracto-keratometer of the present invention, and an additional apparatus is not necessary for examining the fitting state of the contact lens. In addition, by the present invention, the contact lens fitting state can be consistently evaluated regardless of the examiner's experience or skill.

Problems solved by technology

Thus, tear is not properly circulated, impurities cannot be properly removed from eye, and oxygen cannot be properly supplied to the eye.

Thus, the contact lens user may feel inconvenience in eyelid movements and a corneal xerosis.

Especially, the observation apparatus simply displays a magnified image of an eye, but doest not provide any useful information.

In addition, since at least two apparatuses are necessary, the arrangement of the apparatus is complicated, and a skilled person is necessary for using the apparatus.

Thus, the contact lens prescription process cannot be effectively carried out with the prior apparatus.

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